Instrumentation Study on Solar Energy Conversion system into Hydrogen Using Low Temperature Reactive Ceramics

将太阳能转化为氢能预计将成为下一个世纪中太阳能利用的创新方法，因为集中的太阳能/化学能的理论转化效应将达到70%。低温度操作类型的集中的太阳能/氢能转换器被构建成按顺序利用的热/热/使用低温度反应性陶瓷的化学能源转换系统直到现在已经确定，《日本太阳能与氢能的转化效应》（东京）使用这个设备进行了测量，当Boudouard反应使用一个椭圆形镜子的光束下降控制器进行了性能测试，大约1000℃的温度稳定存在，等等。50%的CO-D22-D2 is reacted to generate CO. As the results of the CO generation rate， it is demonstrated that solar energy of 7 W （max ： 10 W， conversion efficiency ：30%） is converted to chemical energy。Thus， this concentrator is suitable for the solar thermochemical process， and in addition， solar/chemical energy conversion efficiency can be obtained up to 50%（theoretical value ：80%） by improvement of the equipment。Water splitting reaction by FeイD23イD24イD2/NaイD22イイD22イD2O system was also carried out using the solar concentrator。在反应产品的XRD模式中，NaFeO D22和D2的峰值被观察到，并指示反应过程。产生的氢的数量几乎与磁性将其注入反应堆的相关性有关，而且作为反应管使用的不锈钢的一部分也被反应到生产氢的生产中。Cavity型反应堆的发展以获得高太阳能/化学能量转换的效率现在正在进行中。

Converting solar thermal energy to hydrogen energy is expected to be an innovative method for solar energy utilization in the next century because theoretical conversion efficiency of concentrated solar thermal/chemical energy is up to 70%.Concentrated solar energy/hydrogen energy converter of the low-temperature operation type was constructed in order to utilize heat/chemical energy conversion system using the low temperature reactivity ceramics which has been established until now, and the conversion efficiency of solar energy to hydrogen energy in Japan (Tokyo) was measured by using this equipment.When the Boudouard reaction was performed using the beam down concentrator with an elliptical mirror, the temperature of about 1000℃ was stably obtained, and ca. 50% of COィイD22ィエD2 was reacted to generate CO. As the results of the CO generation rate, it is demonstrated that solar energy of 7 W (max : 10 W, conversion efficiency : 30%) is converted to chemical energy. Thus, this concentrator is suitable for the solar thermochemical process, and in addition, solar/chemical energy conversion efficiency can be obtained up to 50% (theoretical value : 80%) by improvement of the equipment.Water splitting reaction by FeィイD23ィエD2OィイD24ィエD2/NaィイD22ィエD2COィイD23ィエD2/HィイD22ィエD2O system was also carried out using the solar concentrator. In the XRD pattern of the reaction product, the peaks of NaFeOィイD22ィエD2 was observed, indicating that the reaction proceeded. The amount of generated hydrogen is almost correspondent to that of magnetite putting into the reactor, though a part of the stainless steel used as a reaction tube was also reacted to produce hydrogen.Development of cavity-type reactor to obtain high solar/chemical energy conversion efficiency is now in progress.